IIIv MISCELLANEOUS. 619 



3042. Clinometer, by General Naser. 



Survey Office, Christiania, Norway. 



This apparatus consists of a thin circular brass box, vertically fixed on 

 three screws, by means of which the exact position can be maintained. 

 Through the centre of the box moves an axis, supporting on one side a small 

 telescope, and on the other a needle, following the movements of the telescope, 

 and giving the readings of the tangential scale engraved on the box. By a 

 small exchange-wheel, the angle between the optical axis of the telescope and 

 the horizon is multiplied 10 times, thus enabling the operator to read off the 

 tangent with sufficient accuracy. The horizontal distance between two ob- 

 jects being known, the difference in height can easily be found. The instru- 

 ment can be used with advantage for distances up to 15 miles, and generally 

 for all levelling purposes. 



3043. Clinometer, by G. Olsen. 



Survey Office, Christiania, Norway. 



This apparatus consists of a square box, in which a pendulum moves on a 

 horizontal axis. At the lower end of the pendulum a tangential scale is fixed, 

 which doubly reflects in two small mirrors placed over the top of the pendu- 

 lum. On the outer side of the box a small telescope is fixed, movable in the 

 vertical plan. Pointing through this glass to an object whose horizontal 

 distance is known, you can, by reading off the division on the scale that coin- 

 cides with the object, easily find the difference in height by referring to a table. 

 The instrument needs no corrections, is very handy, and easily transported, 

 but can not be used at such long distances as the clinometer constructed by 

 General Naser. 



3043a. Ship's Clinometer. L. Casella. 



3044. Pocket " Mensor." An improved arrangement or 

 combination of various mathematical or philosophical instruments 

 for measuring and other purposes. Ridley Henderson. 



This instrument, when folded up, measures 3 inches square by 2 inches 

 deep, and weighs 2 Ibs. 2 ounces. 



It contains within a box, hinged together in three parts, twenty instruments, 

 as follows : Anemometer, aneroid barometer, clinometer, goniometer, ther- 

 mometer, circumferentor, protractor dial, prismatic compass, hypo-thonite, 

 quadrant, spirit level, limb and sights for taking altitudes, sun-dial, callipers, 

 plummet, magnifying lens, Nicol prism, scale of inches, scale of chains ; 

 added to which are arranged two tables of constants and useful formulae, and 

 an easy method of ascertaining the variation of the magnetic needle. 



It is a measurer of time, heat, velocity, and pressure, also of height, depth, 

 length, and breadth ; and of horizontal, vertical, acute, and oblique angles. 



It is made so portable in form and weight as to enable it to be carried in 

 the pocket, and yet it possesses sufficient size and strength to render it a 

 reliable and useful companion to military, civil, and mining engineers, geolo- 

 gists, mineralogists, railway and land surveyors, and travellers. 



3045. Theodolite-Level. A combination of the two instru- 

 ments. Patrick Adie. 



3O46< Patent Level. A combination of the V an d Dumpy 

 patterns. Patrick Adie, 



